We Indian are known to live with nature in full harmony. From the ancient time the Traditions of India are full of sustainability. Many examples can be cited for this.
The fortnight of Shradh parv of Hindu religion is one of such example. This time is marked by remembering our pitra by offering cooked food and doing some ritualistic pooja and then distributing the anna to Brahmana and needy people.
In this way,not only we remember our forefathers but also learn to respect the needy people and other creatures like crow and dog. The simple rituals take us near to the environment.
The light and smoke of bhog burnt with ghee removes the little insects and worms that have prospered due to Monsoon and Rainy moist 4 month season and cleans the atmosphere. Although burning dry cowdung pollutes the air yet the ghee burning does some purification of the air too.
Ms Seema Gupta